91901066 has 4 divisors (see below), whose sum is σ = 137851602. Its totient is φ = 45950532.

The previous prime is 91901063. The next prime is 91901071. The reversal of 91901066 is 66010919.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 91604041 + 297025 = 9571^2 + 545^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91901063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22975265 + ... + 22975268.

Almost surely, 2^91901066 is an apocalyptic number.

91901066 is a deficient number, since it is larger than the sum of its proper divisors (45950536).

91901066 is a wasteful number, since it uses less digits than its factorization.

91901066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45950535.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 91901066 is about 9586.5043681208. The cubic root of 91901066 is about 451.2738654208.

The spelling of 91901066 in words is "ninety-one million, nine hundred one thousand, sixty-six".